Fort Worth daily gazette. (Fort Worth, Tex.) 1882-1891, 1887-05-02
POPULAR SCIENCE.

Bits of Practical Information for Every
bOdy's Use.
A chimney only fifty-six feet high, built
in common lime mortar, osciIlated to an
alarming degree. Consequently the Chin
ney was loaded by putting on the top an
iron plate weighing upward of 250 pounds.
The cure was perfect. Although the stack
is built in an exposed situation, it has
stood for sixteen years, during which
many severe storms have tried it's
strength, yet IL does not show any hOri-
Zontal or vertical cracks. Similar results
are recorded in connection with the
construction Of a mill st Mullfort,
near Rhevdt. Here milI-owner found
it necessary to heighten building by
two stories without interrupt!ng work in
the factory below. The constant vibra-
ton caused by the machinery, however,
destroyed the walls as fast g. the bricks
were laid. To check this effect the walls
were heavily loaded with iron rails as fast
as the cement would bear them, and by
this means the additional height was
safely reached, the vibration If the walls
being completely stopped Engineering
An English scientific Journal enumer-
ates the following as among the inven-
tiOns which are specially n eded at the
present time: Macaroni machinery, good
red lead-pencils, type writers that will
| work on account books and 1ecord books,
indelible stamp canceling ink, practical
car starter, good railWay-cer ventilstor,
better horseshoes, locomotive headlights,
| instrument for measuring The velocity Of
wind currents, apparatus for measuring
the depth of the sea without sounding by
| line, piano-lid hinge which : IalI be flush
on the outside, good fluid ldia ink for
draughtsmen, a good metali railway tie,
an effective cutoff for locomotives, q
method of alloying copper AID iron, and
holding material for iroa and brass
casting capable of giving 'aold that can
be used over and over agaii.
a set of small drawers ipr workshop
use that will hold poWG RS, or even
| liquids, is useful. Obtain from the
hotels a number of sardine boxes. Lay
the box top downwards on the stove, and
| when the solder begins to melt lift the
| box, and the ragged remains Of the cover
will fall off. After cleaniDg out the oily
! deposit, put in each box q facing OF
wood little larger than the end and
screw little knob to this + IN the point,
punching hole through the Indy an aWl.
a rack to hold them is e8~ly made, as
as they are all of the same re.
The Electrical Review giv.s the follow
ing as an etching liquid for steel: Mix
one ounce sulphste of copper, one-half
ounce alum and sone-half teaspoonful Of
salt reduced to powder, with one gill Of
vinegar and twenty drops Of nitric acid.
This liquid may be used for either eating
deeply into the metal or for imparting a
beautiful frosted appearance to the sur
face, according to the time it is allowed
to act. Cover the parts you wish to pro-
tect from it's influence with beeswax or
talloW.
The reason OF "the sun putting out a
fire" is thus explained: At the time of
day when the sun shines into room the
fire is often allowed to get dull, and the
suns rays warm andsrarify the air in the
room as much as the fire warns the air
| passing over it up the chimney. Hence
the draft ceases and the fire goes cut. To
remedy the inconvenience open the door
| or the window to let the warm air out
and cold in.
From the current of an induction coil,